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Organic electroluminescence panel and method for manufacturing the same

a technology of electroluminescence panel and electroluminescence layer, which is applied in the direction of discharge tube luminescnet screen, discharge tube/lamp details, electric discharge lamps, etc., can solve the problems of cathode deformation, peeled, and prone to deformation of organic layers, and achieve reliable prevention of moisture diffusion and reduce the effect of deformation of these layers

Inactive Publication Date: 2005-12-08
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This configuration effectively prevents moisture diffusion into the organic EL elements, reducing the risk of cathode deformation and enhancing the reliability of moisture protection without adding excessive stress.

Problems solved by technology

These organic layers are apt to degrade when exposed to moisture.
Although it is possible to increase the thickness of the cathode as a solution, for example, when the thickness is too large, the cathode would be deformed and peeled due to the resulting stress.

Method used

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  • Organic electroluminescence panel and method for manufacturing the same
  • Organic electroluminescence panel and method for manufacturing the same
  • Organic electroluminescence panel and method for manufacturing the same

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Embodiment Construction

[0014] A preferred embodiment of the present invention will be described with reference to the accompanying drawings.

[0015]FIG. 1 is a cross sectional view showing a main portion of one preferred embodiment of the present invention. On a glass substrate 10, an insulating layer 12 formed of two layers, an SiO2 layer and an SiNx layer, which are accumulated in this order, is provided so as to prevent impurities from entering the glass substrate 10. On predetermined portions of the insulating layer 12, a great number of thin film transistors are formed. Although in FIG. 1, a second TFT which is a thin film transistor for controlling current flowing from a power source line to the organic EL element is shown, a first TFT (a switching TFT) is also provided for each pixel for controlling accumulation of voltages supplied from the data line into a capacitor. The second TFT is switched on in accordance with the voltage accumulated in the capacitor for controlling current flowing from the p...

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Abstract

On a cathode (40) of an organic EL element, a stress reducing layer (42) formed by a material which is the same as that used for an organic layer of the organic EL element is formed. A moisture block layer (44) formed by a material which is the same as that used for the cathode (40) is then formed on the stress reducing layer (42). Thus, entering of moisture is effective prevented while the stress is reduced.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an organic electroluminescence (EL) panel having organic EL elements arranged in a matrix on a substrate, and more particularly to such an organic EL panel which can effectively prevent moisture from entering the organic EL elements. [0003] 2. Description of Related Art [0004] Organic EL display panels have conventionally been known as one example of flat display panels. Because, unlike liquid crystal display (LCD) panels, organic EL display panels are self emissive and because organic EL display panels are bright and clear flat display panels, their widespread use is highly expected. [0005] An organic EL display comprises a great number of organic EL elements arranged in a matrix, and employs these organic EL elements as pixels of a display. Such organic EL displays can be driven passively or actively, similar to LCDs, and, also as is the case with LCDS, active matrix displays are m...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H05B33/04H01L27/32H01L51/50H01L51/52H05B33/10H05B33/26
CPCH01L51/5237H01L27/3244H10K59/871H10K59/131H10K59/873H05B33/04H10K50/844H10K50/841H10K59/12
Inventor NISHIKAWA, RYUJIIKEDA, NORIHIRO
Owner SANYO ELECTRIC CO LTD